阳离子艳蓝作为沉淀滴定指示剂的研究

Study on the Basic Blue as the Indicator for Precipitation Titration

本文采用阳离子艳蓝2RL作为滴定I^-、Br^-离子的吸附指示剂，当滴定的pH值范围为3．5～5．2，温度为60℃时，终点颜色由蓝色迅速变为无色，滴定I^-、Br^-离子的误差分别为0．09％、0．34％。

In this paper, it was found that the basic blue 2RL can be used as the absorption indicator of titration for I^- and Br^-. With titration acidity of pH 3.5-5.2, temperature of about 60℃, the solution turned quickly colorless from blue at the end point, titration error is 0. 09% for I^- and 0. 34% for Br^-, respectively. This result demonstrated that basic blue could be a new indicator for precipitation titration.